Great deal on a fast charger for both in house and travel charging Recharges 2 or 4 pieces of size AAA, AA Ni-MH & Ni-Cd batteries in 2-3 hours Includes "intelligent" microprocessor controlled charging. Identifies defective cells and a safety timer for complete overcharge protection Powered by an external AC adaptor for both indoor use or for in car usage Also recharges inside a car with the included cigarette lighter that you can plug to your 12V car battery Negative Delta V Cut off feature to 100% protect your batteries With mechanical design against wrong polarity and short circuit protection Automatic charge current selection for AA & AAA batteries Red LED indicates charging; green LED indicates charging completed and charger is in "trickle charge" mode Especially designed for rechargeable batteries used in Digital Camera, Handheld PC, PAD, Game Boy and CD players and other high drain rate electronic devices. Input: 120V